单项选择题
Ships at sea are in urgent need of MSI because they are（）various kinds of danger.
A.subject for
B.liable to
C.easy to meet
D.always encounter
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相关考题
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单项选择题
In the GMDSS, MSI broadcasts will be made on two dedicated systems:（）and（）.
A.NBDP/VHF radio
B.Inmarsat safetyNet/NAVTEX
C.Safety service / Inmarsat-A
D.Long range / short range -
单项选择题
International SafetyNet and Navtex Services promulgate MSI by means of（）.
A.FEC and ARQ
B.satellite and terrestrial communications
C.radio and telex
D.NBDP -
单项选择题
With the help of modern technology, ships are able to receive automated broadcast of safety messages（）.
A.by day or at night
B.almost round the clock
C.somewhat and sometime
D.from sunrise to sunset
